According to the U.S. Bureau of Labor Statistics, prices for personal computers and peripheral equipment were
87.49% lower
in 2018 versus 2001.

Between 2001 and 2018:Personal computers and peripheral equipment experienced an average inflation rate of -11.51% per year.
This rate of change indicates significant deflation.
In other words, personal computers and peripheral equipment costing $20 in the year 2001 would cost $2.50 in 2018 for an equivalent purchase.
Compared to the overall inflation rate of 2.03% during this same period, inflation for personal computers and peripheral equipment was
significantly lower.

In the year 2001: Pricing changed by -28.05%,
significantly below the average yearly
change for personal computers and peripheral equipment during the 2001-2018 time period.
Compared to inflation for all items in 2001 (2.83%), price inflation for personal computers and peripheral equipment was
much lower.

Price Inflation for Personal computers and peripheral equipment since 1997

Consumer Price Index, U.S. Bureau of Labor Statistics

Years with the largest changes in pricing:
1999 (-31.61%),
2001 (-28.05%),
and 2002 (-24.97%).

How to calculate the inflation rate for personal computers and peripheral equipment, 2001-2018

Start with the inflation rate formula:

CPI in 2018 / CPI in 2001* 2001 USD value = 2018 USD value

Then plug in historical CPI values from above. The CPI for Personal computers and peripheral equipment was 330.608 in the year 2001 and 41.352 in 2018:

41.352 / 330.608* $20 = $2.50

Therefore, according to U.S. Bureau of Labor Statistics, $20 in 2001 has the same "purchasing power" as $2.50 in 2018 (in the category of Personal computers and peripheral equipment).

Source: U.S. Bureau of Labor Statistics began tracking the Consumer Price Index for Personal computers and peripheral equipment in 1997. In addition to personal computers and peripheral equipment, the index produces monthly data on changes in prices paid by urban consumers for a variety of other goods and services.